Scale is a common problem in water bottles. It can be caused by hard water, which contains minerals that can build up over time. Scale can make your water taste bad and can also be difficult to remove.

Here are three simple ways to remove scale from water bottles:

• Vinegar: Pour some hot vinegar into the bottle, close the lid tightly, shake it gently, leave it for half an hour, then rinse it with clean water. The vinegar will dissolve the scale.
• Baking soda: Add 50 grams of baking soda and a cup of water to the bottle, cover it tightly, shake it gently, leave it for half an hour, and then rinse it with water. The baking soda will also dissolve the scale.
• Eggshells: Crack the egg shells and put them in a water bottle, then pour a few drops of detergent and an appropriate amount of water, cover it, shake it up and down, and finally rinse it with clean water. The eggshells will act as a gentle abrasive to remove the scale.

Additional tips:

• Prevent scale buildup by using a water filter.
• Rinse your water bottle with clean water after each use.
• Do not leave your water bottle in the sun, as this can accelerate scale buildup.

By following these tips, you can keep your water bottles clean and free of scale.